include/ieee-float.h

   1 /* IEEE floating point support declarations, for GDB, the GNU Debugger.
   2    Copyright (C) 1991 Free Software Foundation, Inc.
   3
   4 This file is part of GDB.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #if !defined (IEEE_FLOAT_H)
  21 #define IEEE_FLOAT_H 1
  22
  23 #include "ansidecl.h"
  24
  25 /* Parameters for extended float format:  */
  26
  27 struct ext_format {
  28   unsigned totalsize;           /* Total size of extended number */
  29   unsigned signbyte;            /* Byte number of sign bit */
  30   unsigned char signmask;       /* Mask for sign bit */
  31   unsigned expbyte_h;           /* High byte of exponent */
  32   unsigned expbyte_l;           /* Low  byte of exponent */
  33   unsigned manbyte_h;           /* High byte of mantissa */
  34   unsigned manbyte_l;           /* Low  byte of mantissa */
  35 };
  36
  37 #define TOTALSIZE       ext_format->totalsize
  38 #define SIGNBYTE        ext_format->signbyte
  39 #define SIGNMASK        ext_format->signmask
  40 #define EXPBYTE_H       ext_format->expbyte_h
  41 #define EXPBYTE_L       ext_format->expbyte_l
  42 #define MANBYTE_H       ext_format->manbyte_h
  43 #define MANBYTE_L       ext_format->manbyte_l
  44
  45 /* Actual ext_format structs for various machines are in the *-tdep.c file
  46    for each machine.  */
  47
  48 #define EXT_EXP_NAN     0x7FFF  /* Exponent value that indicates NaN */
  49 #define EXT_EXP_BIAS    0x3FFF  /* Amount added to "true" exponent for ext */
  50 #define DBL_EXP_BIAS     0x3FF  /* Ditto, for doubles */
  51
  52 /* Convert an IEEE extended float to a double.
  53    FROM is the address of the extended float.
  54    Store the double in *TO.  */
  55
  56 extern void
  57 ieee_extended_to_double PARAMS ((const struct ext_format *, char *, double *));
  58
  59 /* The converse: convert the double *FROM to an extended float
  60    and store where TO points.  */
  61
  62 extern void
  63 double_to_ieee_extended PARAMS ((const struct ext_format *, double *, char *));
  64
  65 #endif  /* defined (IEEE_FLOAT_H) */